The line graph compares the percentage of people in different age 
groups
 who went to the gym at least once a month in Europe from 1998 to 2018 and the projection.
  The percentage of the group of 44 to 53 Use synonyms
years
 old Use synonyms
is almost keep
 stably which only rise about 3% in 20 Change the verb form
almost keeps
years
. The group of 34 to 43 Use synonyms
years
 Use synonyms
also
 increased gradually in 20 Linking Words
years
, but the Use synonyms
number of 
the proportion of 34 to 43 Correct quantifier usage
apply
years
 is higher than the 44 to 53 one.  What’s more, it is predicted that the trend of Use synonyms
34
 to 43 group will grow faster than the other one.
  The Correct article usage
the 34
groups
 of 24 to 33 Use synonyms
years
 old and 18 to 23 Use synonyms
years
 old Use synonyms
are 
increased rapidly in total. Unnecessary verb
apply
In
 1998 to 2010, Change preposition
From
Linking Words
this
 two Correct determiner usage
these
groups
 all keep the scale between 15 to 20 Use synonyms
percent
 Change the spelling
per cent
although
 have a Linking Words
slight
 Replace the word
slightly
increased
. 
In summary, the trend of the percentage of gym goers in four age brackets is increasing. Replace the word
increase
According to
 Linking Words
this
 graph, it is easy to Linking Words
found
 that the proportion of the age Wrong verb form
find
groups
 which Use synonyms
less
 than 33 Add a missing verb
are less
years
 old is higher than Use synonyms
Correct pronoun usage
those which
which
 Correct pronoun usage
those
more
 than 33 Add a missing verb
are more
years
 old.Use synonyms